1 /*-
2 * Copyright (c) 2005 Michael Bushkov <[email protected]>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/types.h>
32
33 #include <sys/event.h>
34 #include <sys/socket.h>
35 #include <sys/uio.h>
36 #include <sys/un.h>
37
38 #include <assert.h>
39 #include <errno.h>
40 #include <fcntl.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 #include "debug.h"
46 #include "nscdcli.h"
47 #include "protocol.h"
48
49 #define DEFAULT_NSCD_IO_TIMEOUT 4
50
51 static int safe_write(struct nscd_connection_ *, const void *, size_t);
52 static int safe_read(struct nscd_connection_ *, void *, size_t);
53 static int send_credentials(struct nscd_connection_ *, int);
54
55 static int
safe_write(struct nscd_connection_ * connection,const void * data,size_t data_size)56 safe_write(struct nscd_connection_ *connection, const void *data,
57 size_t data_size)
58 {
59 struct kevent eventlist;
60 int nevents;
61 size_t result;
62 ssize_t s_result;
63 struct timespec timeout;
64
65 if (data_size == 0)
66 return (0);
67
68 timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
69 timeout.tv_nsec = 0;
70 result = 0;
71 do {
72 nevents = kevent(connection->write_queue, NULL, 0, &eventlist,
73 1, &timeout);
74 if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
75 s_result = write(connection->sockfd,
76 (char *)data + result,
77 (size_t)eventlist.data < data_size - result ?
78 (size_t)eventlist.data : data_size - result);
79 if (s_result == -1)
80 return (-1);
81 else
82 result += s_result;
83
84 if (eventlist.flags & EV_EOF)
85 return (result < data_size ? -1 : 0);
86 } else
87 return (-1);
88 } while (result < data_size);
89
90 return (0);
91 }
92
93 static int
safe_read(struct nscd_connection_ * connection,void * data,size_t data_size)94 safe_read(struct nscd_connection_ *connection, void *data, size_t data_size)
95 {
96 struct kevent eventlist;
97 size_t result;
98 ssize_t s_result;
99 struct timespec timeout;
100 int nevents;
101
102 if (data_size == 0)
103 return (0);
104
105 timeout.tv_sec = DEFAULT_NSCD_IO_TIMEOUT;
106 timeout.tv_nsec = 0;
107 result = 0;
108 do {
109 nevents = kevent(connection->read_queue, NULL, 0, &eventlist, 1,
110 &timeout);
111 if ((nevents == 1) && (eventlist.filter == EVFILT_READ)) {
112 s_result = read(connection->sockfd,
113 (char *)data + result,
114 (size_t)eventlist.data <= data_size - result ?
115 (size_t)eventlist.data : data_size - result);
116 if (s_result == -1)
117 return (-1);
118 else
119 result += s_result;
120
121 if (eventlist.flags & EV_EOF)
122 return (result < data_size ? -1 : 0);
123 } else
124 return (-1);
125 } while (result < data_size);
126
127 return (0);
128 }
129
130 static int
send_credentials(struct nscd_connection_ * connection,int type)131 send_credentials(struct nscd_connection_ *connection, int type)
132 {
133 union {
134 struct cmsghdr hdr;
135 char pad[CMSG_SPACE(sizeof(struct cmsgcred))];
136 } cmsg;
137 struct msghdr mhdr;
138 struct iovec iov;
139 struct kevent eventlist;
140 int nevents;
141 ssize_t result;
142 int res;
143
144 TRACE_IN(send_credentials);
145 memset(&cmsg, 0, sizeof(cmsg));
146 cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));
147 cmsg.hdr.cmsg_level = SOL_SOCKET;
148 cmsg.hdr.cmsg_type = SCM_CREDS;
149
150 memset(&mhdr, 0, sizeof(mhdr));
151 mhdr.msg_iov = &iov;
152 mhdr.msg_iovlen = 1;
153 mhdr.msg_control = &cmsg;
154 mhdr.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));
155
156 iov.iov_base = &type;
157 iov.iov_len = sizeof(int);
158
159 EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
160 NOTE_LOWAT, sizeof(int), NULL);
161 res = kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
162
163 nevents = kevent(connection->write_queue, NULL, 0, &eventlist, 1, NULL);
164 if ((nevents == 1) && (eventlist.filter == EVFILT_WRITE)) {
165 result = sendmsg(connection->sockfd, &mhdr, 0) == -1 ? -1 : 0;
166 EV_SET(&eventlist, connection->sockfd, EVFILT_WRITE, EV_ADD,
167 0, 0, NULL);
168 kevent(connection->write_queue, &eventlist, 1, NULL, 0, NULL);
169 TRACE_OUT(send_credentials);
170 return (result);
171 } else {
172 TRACE_OUT(send_credentials);
173 return (-1);
174 }
175 }
176
177 struct nscd_connection_ *
open_nscd_connection__(struct nscd_connection_params const * params)178 open_nscd_connection__(struct nscd_connection_params const *params)
179 {
180 struct nscd_connection_ *retval;
181 struct kevent eventlist;
182 struct sockaddr_un client_address;
183 int client_address_len, client_socket;
184 int res;
185
186 TRACE_IN(open_nscd_connection);
187 assert(params != NULL);
188
189 client_socket = socket(PF_LOCAL, SOCK_STREAM, 0);
190 client_address.sun_family = PF_LOCAL;
191 strlcpy(client_address.sun_path, params->socket_path,
192 sizeof(client_address.sun_path));
193 client_address_len = sizeof(client_address.sun_family) +
194 strlen(client_address.sun_path) + 1;
195
196 res = connect(client_socket, (struct sockaddr *)&client_address,
197 client_address_len);
198 if (res == -1) {
199 close(client_socket);
200 TRACE_OUT(open_nscd_connection);
201 return (NULL);
202 }
203 fcntl(client_socket, F_SETFL, O_NONBLOCK);
204
205 retval = calloc(1, sizeof(*retval));
206 assert(retval != NULL);
207
208 retval->sockfd = client_socket;
209
210 retval->write_queue = kqueue();
211 assert(retval->write_queue != -1);
212
213 EV_SET(&eventlist, retval->sockfd, EVFILT_WRITE, EV_ADD,
214 0, 0, NULL);
215 res = kevent(retval->write_queue, &eventlist, 1, NULL, 0, NULL);
216
217 retval->read_queue = kqueue();
218 assert(retval->read_queue != -1);
219
220 EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD,
221 0, 0, NULL);
222 res = kevent(retval->read_queue, &eventlist, 1, NULL, 0, NULL);
223
224 TRACE_OUT(open_nscd_connection);
225 return (retval);
226 }
227
228 void
close_nscd_connection__(struct nscd_connection_ * connection)229 close_nscd_connection__(struct nscd_connection_ *connection)
230 {
231
232 TRACE_IN(close_nscd_connection);
233 assert(connection != NULL);
234
235 close(connection->sockfd);
236 close(connection->read_queue);
237 close(connection->write_queue);
238 free(connection);
239 TRACE_OUT(close_nscd_connection);
240 }
241
242 int
nscd_transform__(struct nscd_connection_ * connection,const char * entry_name,int transformation_type)243 nscd_transform__(struct nscd_connection_ *connection,
244 const char *entry_name, int transformation_type)
245 {
246 size_t name_size;
247 int error_code;
248 int result;
249
250 TRACE_IN(nscd_transform);
251
252 error_code = -1;
253 result = 0;
254 result = send_credentials(connection, CET_TRANSFORM_REQUEST);
255 if (result != 0)
256 goto fin;
257
258 if (entry_name != NULL)
259 name_size = strlen(entry_name);
260 else
261 name_size = 0;
262
263 result = safe_write(connection, &name_size, sizeof(size_t));
264 if (result != 0)
265 goto fin;
266
267 result = safe_write(connection, &transformation_type, sizeof(int));
268 if (result != 0)
269 goto fin;
270
271 if (entry_name != NULL) {
272 result = safe_write(connection, entry_name, name_size);
273 if (result != 0)
274 goto fin;
275 }
276
277 result = safe_read(connection, &error_code, sizeof(int));
278 if (result != 0)
279 error_code = -1;
280
281 fin:
282 TRACE_OUT(nscd_transform);
283 return (error_code);
284 }
285